Robbie has been the major pick for the role of Tate for a while, following reports Jennifer Lawrence was rejected because Tate's family thought she was "not pretty enough". Assuming she signs on the dotted line, she'll appear in a cast that already includes Brad Pitt and Leonardo DiCaprio.

It's going to be called Once Upon A Time In Hollywood, and will be set in Los Angeles in 1969. Leonardo DiCaprio is starring as Rick Dalton, a former popular television star struggling to make it in the movie business.

At the time of her murder, Sharon was married to controversial filmmaker Roman Polanski. Both are trying to make it in Hollywood. Tarantino's film has come under fire from Tate's sister Debra, who has accused the director of exploiting the tragic star and the 50th anniversary of her death next year (19).

While plot details for the film are still fairly thin on the ground, it sounds as though it won't focus exclusively around Manson or Tate, but will be more a tapestry of lives set against the late 60s LA backdrop.